package com.xgp.pc;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

@SuppressWarnings("all")
public class B {
    public static void main(String[] args) {
        Data2 data = new Data2();

        new Thread(() -> {for(int i = 0;i < 10;i++) {
            try {
                data.increment();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        },"A").start();
        new Thread(() -> {for(int i = 0;i < 10;i++) {
            try {
                data.decrement();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        },"B").start();
        new Thread(() -> {for(int i = 0;i < 10;i++) {
            try {
                data.increment();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        },"C").start();
        new Thread(() -> {for(int i = 0;i < 10;i++) {
            try {
                data.decrement();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        },"D").start();
    }
}

/**资源类**/
class Data2 {
    private int number = 0;

    /**
     * 判断等待、业务、通知
     */
    Lock lock = new ReentrantLock();
    //锁监视器(取代了对象监视器的使用)
    Condition condition = lock.newCondition();

    //+1
    public void increment() throws InterruptedException {
        lock.lock();
        try {
            while (number != 0) {
                // 等待
                condition.await();      //等待
            }
            number++;
            System.out.println(Thread.currentThread().getName() + "=>" + number);
            // 通知其他线程，我+1完毕了
            condition.signalAll();
        }catch (Exception e) {
            e.printStackTrace();
        }finally {
            lock.unlock();
        }
    }
    //-1
    public void decrement() throws InterruptedException {
        lock.lock();

        try {
            while (number == 0) {
                //等待
                condition.await();
            }
            number--;
            System.out.println(Thread.currentThread().getName() + "=>" + number);
            // 通知其他线程，我-1完毕了
            condition.signalAll();
        }catch (Exception e) {
            e.printStackTrace();
        }finally {
            lock.unlock();
        }

    }
}